Active TB drug-safety management & monitoring

Transcription

1 Active TB drug-safety management & monitoring Global TB Programme, WHO, Switzerland 6 August 2015

2 Pharmacovigilance: definition of science and activities relating to the detection, assessment, understanding and prevention of adverse effects or any other drugrelated problem. WHO

3 3 Methods Spontaneous reporting Targeted reporting Active monitoring

4 Active drug-safety monitoring (1) Pro-active efforts made to elicit adverse events Events detected by asking patients directly, screening patient records, laboratory & clinical tests It is best done prospectively Follow-up continues after treatment has ended Adverse event (AE) reporting not just focused on known reactions for a drug or which are plausible based on pharmacology

5 Active drug-safety monitoring (2) Cohort approaches are the most comprehensive; they fit the framework which national TB programmes are familiar with when monitoring TB cases for response to treatment and assigning outcomes In addition to monitoring, drug-safety concerns detected should lead to action for the benefit of the individual patient, and, possibly, on national and international policy in the use of the drug

6 Shorter regimens for MDR-TB (1) WHO advice to countries (since 2012): 1.approval of the project by a national ethics review committee, ahead of patient enrolment; 2.delivery of treatment under operational research conditions following international standards (including Good Clinical Practice and safety monitoring), with the objective of assessing the effectiveness and safety of these regimens (active pharmacovigilance); 3.monitoring of the MDR-TB component of the TB programme, and its corresponding research project, by an independent monitoring board set up by and reporting to WHO.

7 Shorter regimens for MDR-TB (2)

8 Shorter regimens for MDR-TB (3) UNION multi-centre project MSF centres (Uzbekistan, Swaziland)

9 August 2014 (update April 2015) pp339ff

10 pp pp

11 Other online resources :

12 Meeting of technical agencies on active TB drug-safety management and monitoring Geneva, July 2015 Task force composed of technical and financial partners Principles and practices underpinning active TB patient drugsafety management and monitoring ( admm ), focused on the specifics of TB programmes Revise definitions and methods for admm Update WHO policy and implementation guidance (incl. FAQs) Creation of a global database for active TB drug-safety monitoring data Develop plan to improve competence in admm methods, including signal detection & causality assessment

13 Active TB drug-safety management and monitoring: features Prospective surveillance of adverse events associated with one or more medicines in a cohort of TB patients and rapid action upon detected harms

14 Active TB drug-safety monitoring framework (1) Serious event Other event Serial testing / screening for AEs Death Success Success Loss to f/u Change of treatment Drug start Drug exposure F/u after treatment

15 Active TB drug-safety monitoring framework (2) organising the cohort Define the cohort, start recruitment Size of cohort : not necessarily 10,000 10,000 observations -> 95% chance of observing a specific rare event that has a frequency of 1/3,000. Planning, resource mobilization, coordination of treatment sites, supervision, monitoring, data management, analysis and communication of results

16 Active TB drug-safety monitoring framework (3) initiation form

17 Active TB drug-safety monitoring framework (4) review form (1)

18 Active TB drug-safety monitoring framework (5) review form (2)

19 Active TB drug-safety monitoring framework (6) create database Build upon existing, functional e-register Good practices in data entry & transfer Simplicity for use and adaptation Interoperates with the global registries

20 Active TB drug-safety monitoring framework (7) data analysis & identifying signals Checks & routines to validate the data Procedures Responsibilities Decision on signals and communication

21 Active TB drug-safety monitoring framework (8) information cycle 7. COMMUNICATION 1. DECISIONS ON PARAMETERS & IT SYSTEM 2. TRAINING 3. TESTING & DATA COLLECTION 6. ANALYSIS, SIGNAL DETECTION 5. SUPERVISION 4. DATA ENTRY

22 Active TB drug-safety monitoring framework (9) Expected intensity of work over time Processes Q1 Q2 Q3 Q4 Define cohort ++ + Do serial clinical & lab tests Create expert group ++ Create protocol ++ Manage & supervise Train staff /- Create data collection material ++ Create e-database ++ + Collect & enter data Identify signals and data analysis +/- +/- +

23 Active TB drug-safety monitoring framework (10) key steps Elements Convene an expert group on admm Develop admm plan / protocol Define management and supervision roles and responsibilities Train staff at different levels Create standard data collection material Define schedule and route for data collection and reporting Create database with core elements Develop capacity for signal detection and data analysis Stage early; use existing body early; use local / international expertise at start before starting enrolment before starting enrolment at start early over time; engage local and international expertise

24 Active TB drug-safety monitoring framework (11) things to have in place before starting Before starting active monitoring: 1.preparations for the collection of data (paper or electronic forms); and 2.staff properly trained to collect the data Coordination ideally involves experts from relevant disciplines, convened by the NTP early on to steer the surveillance at national level (e.g. as one function of the MDR committee).

25 Active TB drug-safety monitoring framework (12) training of staff Different users; not all may be familiar with TB and TB drugs Trainees: health care providers (public / private; 1 ary health care / hospital), surveillance, IT specialists, regulatory, academia Find trainers & organise training ahead of start

26 Active TB drug-safety monitoring framework (13) steering group NTP assigns someone to coordinate the activities and to oversee active TB drug-safety surveillance Ensure that the two minimum elements are in place Develop a protocol and have it approved Integrated within an existing body (e.g. TB consilium) Constituencies represented: therapeutics, surveillance, regulatory, pharmacy, academia, research, ethics, finances, communication, patients and civil society

27 Active TB drug-safety monitoring framework (14) local adaptations Needs assessment : what gaps in TB drug-safety monitoring? ethics approval? Involvement of national drug-regulatory authority: expertise in causality assessment as per NTP demand and handle reporting of ADRs detected Agreement on how to respond to signals (threshold, communication of risk or detected harm ) Human resources needed and budget Adjust the data management requirements to any existing system for TB/MDR-TB patient data

28 Immediate uses of the data 1. Causality assessment 2. Signal detection 3. Indicators 4. Drug-safety profiles

29 Adapted from WHO 2012 ( Data flows for active TB drug safety monitoring: processing, repository, analysis, action and communication

30

31 In conclusion (1) Challenges posed by novelties in terminology, clinical testing (type and intensity), data collection & consolidation, national & supranational reporting, type of analysis However experience and best practices in active TB drug-safety monitoring using cohort approaches in MDR-TB patients at programme level is developing

32 In conclusion (2) More work needed to assist countries to implement active TB drug-safety monitoring implement the AE management component define how to link records for signal detection (and contribute to supranational monitoring) develop associated skills If the admm component is to develop and become a standard of TB patient care, fresh resources domestic and donor (GF, USAID, UNITAID) - will be needed

33 Additional slides on technical detail

34 Which AE data to capture in the database? Exact value, even when normal (e.g. H globin 14.2g/dL) Exact value, starting from mild severity Exact value, starting from moderate severity Indication of «not done/normal/mild/moderate/severe» Indication of «not done/normal/abnormal» Indication of «serious»

35 cutting down AE data: at what price? Limiting event data (i) establish clinically significant trends (e.g. rising creatinine; decreasing haemoglobin; prolongation of QTc) (ii) miss rare events which may not reach the seriousness or severity threshold because of dose-dependency (iii) differentiate between a normal from a missing value (iv) analysis of pooled data across projects may be complicated by variability in thresholds Limiting cohort (e.g. sentinel surveillance) (i) reducing the number of observations (ii) different level of patient monitoring

36 Seriousness & severity (1) definitions A serious reaction is one which involves any of the following: death or a life-threatening experience; hospitalization or prolongation of hospitalization; persistent significant disability; or congenital anomaly Severity reflects the intensity of an event. Subjective assessment of patient and/or HCW Impact on patient s activities The underlying cause can be serious or not serious. Different scales to classify severity

37 Seriousness & severity (2) scales of severity Simplest : a range from mild-> moderate-> severe No detailed scales developed for TB: adapted from chronic disease (HIV or cancer) ANRS : used by the multi-centric study of shorter regimens (with some adaptations) Others : DAIDS, CTCAE grading system

38 Seriousness & severity (3) DAIDS scale (accessed 10 July 2015)

39 Causality assessment Estimating the probability of a relationship between exposure to a medicine and the occurrence of an adverse reaction

40 Causality assessment (1) 2 basic questions - Is there a convincing relationship between the drug and the event? - Did the drug actually cause the event?

41 Causality assessment (2) main things to look out for Is the time to onset of the event compatible with the suspected cause (plausible time-frame)? Did the event occur after the start of some other medicine or new illness? Is the event plausible with what is known about the drug? Is there any other possible cause for the event? What is the response to withdrawal of the medicine (dechallenge)? What is the response to rechallenge? Is the event severe / serious (causality assessment prioritised)

42 Causality assessment (3) approaches to assess causality Method Principles + / - Reproducibility Expert opinion Based on judgement of individual experts Subjective Low Algorithms Follows a decision tree defined by experts / pharmacology More standardized than expert opinion Low (subjective) Probability assessment Bayesian approach Need special skills; numeric data Considered «gold standard» Adapted from R Benkirane (WHO-CC Morocco; 2014)

43 Causality assessment (4) key data elements for causality assessment Medical history (incl. concomitant disease) Details of drugs taken : names, doses, routes Start and stop dates and indications for use Description of adverse event, including clinical description, laboratory results, and date of onset / end Evolution of event, severity/seriousness, outcome

44 Causality assessment (5) categories of relationship 1. Certain 2. Probable 3. Possible 4. Unlikely 5. Unclassified (or conditional) 6. Unassessable

45 Category Causality assessment (6) classification of relationship Time to event plausible? Other explanation excluded? Recovery after withdrawal? Recurrence after rechallenge? notes Certain Yes Yes Yes Yes Exception: anaphylactic reaction Probable Yes Yes Yes No or? Possible Yes No or?? No or? Unlikely No No or? No No or? Suggestive if event resolves despite continued exposure

46 Signal Reported information on a possible causal relationship between an adverse event and a drug, the relationship being unknown or incompletely documented previously

47 Signal detection (1) principles - usually >1 event with a similar, strong relationship to a medicine ( certain or probable ). Events coded as possible can be used as supporting evidence - a cluster of unexpected deaths coded as possible forms an exception to this general rule and will need to be taken seriously - occasionally a single event ( certain or probable ) - notable for its severity, seriousness or distinctiveness - can be regarded as a signal

48 Signal detection (2) pointers to events to investigate Data are reliable Several reports show a credible and strong relationship between event and drug The event is of sufficient importance or interest : to require regulatory action to require advice to prescribers for scientific / clinical purposes

49 Signal detection (3) methods of signal identification 1. Clinical assessment of individual events 2. Clinical review of collated events 3. Record linkage (eg, with mortality register) 4. Automated signal detection

50 Signal detection (4) clinical assessment of individual events Standardized assessment of individual reports with alertness to the possibility of a signal If new type of ADR is suspected, search for other similar events in references eg, Martindale, Micromedex, Physicians Desk Reference If there is no reference to the occurrence of the event as an ADR -> investigate

51 Drug safety profile Draft framework for the summarization of added benefit and risk associated with an intervention

52 Indicators (1)

53 Indicators (2)

54 Indicators (3)

55 Commissioning electronic systems according to needs WHO/HTM/TB/ whqlibdoc.who.int/publications/2012/ _eng.pdf